x = int(input())

print('Yes') if x >= 30 else print('No') x = int(input()) x int(input()) int input() input print('Yes') if x >= 30 else print('No') x >= 30 x 30 print('Yes') print 'Yes' print('No') print 'No' x = int(input()) int(input()) x
x = int(input())

print('Yes') if x >= 30 else print('No')
